From babcf3cb22af24725030ad795f2e41d024afced3 Mon Sep 17 00:00:00 2001
From: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Date: Fri, 17 Oct 2008 13:19:54 +0200
Subject: [PATCH] libudev: fix sysnum logic for digit-only device names

---
 udev/lib/libudev-device.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/udev/lib/libudev-device.c b/udev/lib/libudev-device.c
index 65ba6e30d..b5d42354e 100644
--- a/udev/lib/libudev-device.c
+++ b/udev/lib/libudev-device.c
@@ -936,8 +936,13 @@ int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath
 	}
 
 	/* trailing number */
-	while (isdigit(udev_device->sysname[--len]))
+	while (len > 0 && isdigit(udev_device->sysname[--len]))
 		udev_device->sysnum = &udev_device->sysname[len];
+
+	/* sysname is completely numeric */
+	if (len == 0)
+		udev_device->sysnum = NULL;
+
 	return 0;
 }
 
-- 
2.30.2